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The diagram shows a simple circuit with two switches connected in series to control a lamp.

If several on-off switches are connected in parallel only one needs to be closed (on) to complete the circuit.

With the switch open the circuit is broken - so electricity cannot flow and the lamp is off.

When electricity was discovered scientists tried many experiments to find out which way the electricity was flowing around circuits. In those early days they found it was impossible to determine the direction of flow.